It's ok either way for me. Since you have color shading, I don't know that it's necessarily. Another thing you could do is pick a few spots where the shadows should be a fill some with almost straight black. A great place for that would be that one big mountain where you currently have the fine lines...

Note, when looking at the map from a macro level(not zoomed in), the one with the fine lines looks much better since it gives it a bit more depth.